Hi folks,

Having a heck of a time filling my loop. I have an Aquacomputer D5 Next pump which is really tucked away and not visible--I know it's not ideal because it has a display and controls on it, but I really really wanted an aquabus pump to go with my aquaero. Guess that was a dumb choice. The D5 Next is connected by USB to a USB hub (which is not connected to the PC yet), by aquabus to the aquaero (which is on), and by SATA power to the PSU

I've made sure that the loop is airtight using an air test. Now I'm filling it. There are definitely still big air bubbles present but I've tried to shake it around a bit. At this point, the res is totally fully so I need the pump to start moving some water around. When I push the water out of the res using a small hand pump feeding in to the res (same way I air tested the loop), as soon as I release the pressure a bit the res fills right back up.

Here are my issues:

• 
  D5 Next makes a horrible "running dry" sound on occasion. To fix it, I have to use the hand pump to push water to it
• 
  When it's not "running dry," there seems to be almost no flow. I can tell that it's on--I hear it, I can see the water in the tubes next to it shaking around a bit, and the fittings are vibrating, but there's very little flow.
• 
  After a short time of operation--doesn't seem to be a consistent time but between 3-8 minutes I think--the pump starts flashing red and making a beeping noise. Because it's completely inaccessible to me, I can't really see what the display says.

Needless to say, taking apart the loop--electrical connections and rigid glass tubing--would be a HUGE pain in the butt. I'd like to figure out what the issue is without doing so. Any tips?